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The term ice-9 is from a book by Kurt Vonnegut called Cats Cradle. It is a crystaline form (fictional) of water ice that is solid at room temperature and also acts as a seed crystal that converts all water to ice-9. So in the book, a crystal is dropped into a body of water and turns all water on earth solid thereby effectively ending all life. Although ice-9 is fictional other forms (ice-13 I think) are theroretically possible under very extreme conditions (say on the surface of Jupiter).
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